RE: [PATCH v7 08/10] dt-bindings: ufs: Add DT binding documentation for ufs

Alim Akhtar
2020-05-09T00:38:58Z

Hi Rob,

> -----Original Message-----
> From: Rob Herring <robh@kernel.org>
> Sent: 05 May 2020 21:29
> To: Alim Akhtar <alim.akhtar@samsung.com>
> Cc: devicetree@vger.kernel.org; linux-scsi@vger.kernel.org;
krzk@kernel.org;
> avri.altman@wdc.com; martin.petersen@oracle.com;
> kwmad.kim@samsung.com; stanley.chu@mediatek.com;
> cang@codeaurora.org; linux-samsung-soc@vger.kernel.org; linux-arm-
> kernel@lists.infradead.org; linux-kernel@vger.kernel.org
> Subject: Re: [PATCH v7 08/10] dt-bindings: ufs: Add DT binding
documentation
> for ufs
>
> On Sun, Apr 26, 2020 at 11:00:22PM +0530, Alim Akhtar wrote:
> > This patch adds DT binding for samsung ufs hci
> >
> > Signed-off-by: Alim Akhtar <alim.akhtar@samsung.com>
> > ---
> > .../bindings/ufs/samsung,exynos-ufs.yaml | 93 +++++++++++++++++++
> > 1 file changed, 93 insertions(+)
> > create mode 100644
> > Documentation/devicetree/bindings/ufs/samsung,exynos-ufs.yaml
> >
> > diff --git
> > a/Documentation/devicetree/bindings/ufs/samsung,exynos-ufs.yaml
> > b/Documentation/devicetree/bindings/ufs/samsung,exynos-ufs.yaml
> > new file mode 100644
> > index 000000000000..954338b7f37d
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/ufs/samsung,exynos-ufs.yaml
> > @@ -0,0 +1,93 @@
> > +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause %YAML 1.2
> > +---
> > +$id:
> > +https://protect2.fireeye.com/url?k=0b9d9296-560b2be1-0b9c19d9-0cc47a3
> > +12ab0-
> 58b0bd73926e9ff6&q=1&u=http%3A%2F%2Fdevicetree.org%2Fschemas%2F
> > +ufs%2Fsamsung%2Cexynos-ufs.yaml%23
> > +$schema:
> > +https://protect2.fireeye.com/url?k=1fa0a694-42361fe3-1fa12ddb-0cc47a3
> > +12ab0-6911bcc836debe4d&q=1&u=http%3A%2F%2Fdevicetree.org%2Fmeta-
> schem
> > +as%2Fcore.yaml%23
> > +
> > +title: Samsung SoC series UFS host controller Device Tree Bindings
> > +
> > +maintainers:
> > + - Alim Akhtar <alim.akhtar@samsung.com>
> > +
> > +description: |
> > + Each Samsung UFS host controller instance should have its own node.
> > + This binding define Samsung specific binding other then what is
> > +used
> > + in the common ufshcd bindings
> > + [1] Documentation/devicetree/bindings/ufs/ufshcd-pltfrm.txt
> > +
> > +properties:
> > +
> > + compatible:
> > + enum:
> > + - samsung,exynos7-ufs
> > +
> > + reg:
> > + items:
> > + - description: HCI register
> > + - description: vendor specific register
> > + - description: unipro register
> > + - description: UFS protector register
> > +
> > + reg-names:
> > + items:
> > + - const: hci
> > + - const: vs_hci
> > + - const: unipro
> > + - const: ufsp
> > +
> > + clocks:
> > + maxItems: 2
> > + items:
> > + - description: ufs link core clock
> > + - description: unipro main clock
> > +
> > + clock-names:
> > + maxItems: 2
> > + items:
> > + - const: core_clk
> > + - const: sclk_unipro_main
> > +
> > + interrupts:
> > + items:
> > + - description: interrupt signal for various ufshc status
>
> Just 'maxItems: 1' is fine for single item cases.
>
Sure will update
> > +
> > + phys:
> > + maxItems: 1
> > + description:
> > + phandle of the ufs phy node
>
> Can drop description.
>
Ack

> > +
> > + phy-names:
> > + const: ufs-phy
>
> Not much point to a name when only 1 entry.
>
You mean drop the phy-names property itself or just const: ufs-phy? And add
maxItems: 1

> > +
> > +required:
> > + - compatible
> > + - reg
> > + - interrupts
> > + - phys
> > + - phy-names
> > + - clocks
> > + - clock-names
>
> additionalProperties: false
>
Sure will add
> > +
> > +examples:
> > + - |
> > + #include <dt-bindings/interrupt-controller/arm-gic.h>
> > + #include <dt-bindings/clock/exynos7-clk.h>
> > +
> > + ufs: ufs@15570000 {
> > + compatible = "samsung,exynos7-ufs";
> > + reg = <0x15570000 0x100>,
> > + <0x15570100 0x100>,
> > + <0x15571000 0x200>,
> > + <0x15572000 0x300>;
> > + reg-names = "hci", "vs_hci", "unipro", "ufsp";
> > + interrupts = <GIC_SPI 200 IRQ_TYPE_LEVEL_HIGH>;
> > + clocks = <&clock_fsys1 ACLK_UFS20_LINK>,
> > + <&clock_fsys1 SCLK_UFSUNIPRO20_USER>;
> > + clock-names = "core_clk", "sclk_unipro_main";
> > + pinctrl-names = "default";
> > + pinctrl-0 = <&ufs_rst_n &ufs_refclk_out>;
> > + pclk-freq-avail-range = <70000000 133000000>;
> > + phys = <&ufs_phy>;
> > + phy-names = "ufs-phy";
> > + };
> > +...
> > --
> > 2.17.1
> >